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public int hashCode() { return elementhashCode(); }
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public Object getAdapter(Class adapter) { if (adapterisInstance(element)) return element; IResource resource = elementgetResource(); if (adapterisInstance(resource)) return resource; return PlatformgetAdapterManager()getAdapter(this, adapter); } public String getInfo() { try { return elementgetUnderlyingResource()getFullPath() toString(); } catch (JavaModelException e) { FavoritesLoglogError(e); return null; } } }
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724 Content provider
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When the model objects have been created, they need to be linked into the view A content provider is responsible for extracting objects from an input object in this case, the FavoritesManager and handing them to the table viewer for displaying, one object in each row Although the IStructuredContentProvider does not specify this, the content provider has also been made responsible for updating the viewer when the content of FavoritesManager changes After extracting the content provider that was automatically generated as part of the FavoritesView class (see Section 232, The Activator or Plug-in class, on page 83) and reworking it to use the newly created FavoritesManager, it looks something like the following code
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package comqualityeclipsefavoritesviews; import class FavoritesViewContentProvider implements IStructuredContentProvider, FavoritesManagerListener { private TableViewer viewer; private FavoritesManager manager;
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72 View Part
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public void inputChanged( Viewer viewer, Object oldInput, Object newInput ) { thisviewer = (TableViewer) viewer; if (manager != null) managerremoveFavoritesManagerListener(this); manager = (FavoritesManager) newInput; if (manager != null) manageraddFavoritesManagerListener(this); } public void dispose() { } public Object[] getElements(Object parent) { return managergetFavorites(); } public void favoritesChanged(FavoritesManagerEvent event) { viewergetTable()setRedraw(false); try { viewerremove(eventgetItemsRemoved()); vieweradd(eventgetItemsAdded()); } finally { viewergetTable()setRedraw(true); } } }
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Tip: The preceding method uses the setRedraw method to reduce the flicker when adding and removing multiple items from the viewer
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Extracting and modifying the content provider means that the calls to
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setContentProvider and setInput in the createPartControl method
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have changed as follows:
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viewersetContentProvider(new FavoritesViewContentProvider()); viewersetInput(FavoritesManagergetManager());
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725 Label provider
The label provider takes a table row object returned by the content provider and extracts the value to be displayed in a column After refactoring the FavoritesViewViewLabelProvider inner class (see Section 233, The Favorites view, on page 84) into a top-level class and reworking it to extract values from the newly created model object, it looks something like the following code
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CHAPTER 7
class FavoritesViewLabelProvider extends LabelProvider implements ITableLabelProvider { public String getColumnText(Object obj, int index) { switch (index) { case 0: // Type column return ""; case 1: // Name column if (obj instanceof IFavoriteItem) return ((IFavoriteItem) obj)getName(); if (obj != null) return objtoString(); return ""; case 2: // Location column if (obj instanceof IFavoriteItem) return ((IFavoriteItem) obj)getLocation(); return ""; default: return ""; } } public Image getColumnImage(Object obj, int index) { if ((index == 0) && (obj instanceof IFavoriteItem)) return ((IFavoriteItem) obj)getType()getImage(); return null; } }
Views
To enhance the Favorites view with different fonts and colors, implement IFontProvider and IColorProvider respectively (see Section 1325, IColorProvider, on page 523)
Tip: If you are displaying workbench-related objects, WorkbenchLabelProvider and WorkbenchPartLabelProvider contain behavior for determining text and images for workbench resources implementing the IWorkbenchAdapter interface (see Section 2134, IWorkbenchAdapter, on page 788) For lists and single-column trees and tables, implement IViewerLabelProvider to efficiently set text, image, font, and color by implementing a single updateLabel() method
726 Viewer sorter
Although a content provider serves up row objects, it is the responsibility of the ViewerSorter to sort the row objects before they are displayed In the Favorites view, there are currently three criteria by which items can be sorted in either ascending or descending order: Name Type Location
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The FavoritesViewSorter delegates sorting to three comparators, one for each of the criteria just listed In addition, the FavoritesViewSorter listens for mouse clicks in the column headers and resorts the table content based on the column that was selected Clicking on a column a second time toggles the sort order
package comqualityeclipsefavoritesviews; import public class FavoritesViewSorter extends ViewerSorter { // Simple data structure for grouping // sort information by column private class SortInfo { int columnIndex; Comparator<Object> comparator; boolean descending; } private TableViewer viewer; private SortInfo[] infos; public FavoritesViewSorter( TableViewer viewer, TableColumn[] columns, Comparator<Object>[] comparators ) { thisviewer = viewer; infos = new SortInfo[columnslength]; for (int i = 0; i < columnslength; i++) { infos[i] = new SortInfo(); infos[i]columnIndex = i; infos[i]comparator = comparators[i]; infos[i]descending = false; createSelectionListener(columns[i], infos[i]); } } public int compare( Viewer viewer, Object favorite1, Object favorite2 ) { for (int i = 0; i < infoslength; i++) { int result = infos[i]comparator compare(favorite1, favorite2); if (result != 0) { if (infos[i]descending) return -result; return result; } } return 0; }